DB4604 GMR-SD and GMR40-SD Disc Brake Caliper - Spring Applied, Air Released
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DB4604 GMR-SD and GMR40-SD Disc Brake Caliper - Spring Applied, Air Released - 1

DB4604 GMR-SD and GMR40-SD Disc Brake Caliper - Spring Applied, Air Released Disc Centre Line 345 New Pads 375 Fully Worn Pads Nominal dimensions given. For specific dimensions please contact Twiflex Limited. For GMR Mk 2 caliper details see DB 3604 Note: The caliper may be assembled as drawn (right hand assembly) or with arms and thruster oppositely handed. Minimum Pressure for Full Retraction 4·6 bar Maximum Pressure 7 bar Braking Torque kNm 1 kNm = 736·6 lbf-ft 1 bar = 14·5 psi The ratings shown on the above graph are based on fully bedded and conditioned brake pads. For bedding in and conditioning procedures see Publication M1060. Braking Force is defined as the Tangential Force acting on the brake disc at the Effective Disc Radius. Braking Torque (Nm) = Braking Force (N) x Effective Disc Radius (m) where Effective Disc Radius = Actual Disc Rad

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DB4604 GMR-SD and GMR40-SD Disc Brake Caliper - Spring Applied, Air Released - 2

MAXIMUM DISPLACEMENT VOLUME 2-5 I. Parts List

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DB4604 GMR-SD and GMR40-SD Disc Brake Caliper - Spring Applied, Air Released - 3

The GMR-SD and GMR40-SD calipers are available in various ratings, as shown on the performance charts. Part numbers are given below. These are typical performance figures for bedded and conditioned brake pads having a friction coefficient of 0.4 when used with standard Twitlex brake discs. An appropriate ‘service factor’ should be applied when designing the braking system, and in the case of brakes used for holding duties or in wet conditions this should not be less than 2.0. A monitoring unit is also available (Part No. 7700212) which is fitted to the back of the thruster. The unit...

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DB4604 GMR-SD and GMR40-SD Disc Brake Caliper - Spring Applied, Air Released - 4

GMR-SD and GMR40-SD Disc Brake Caliper - Spring Applied, Air Released 2.5 Pad wear can be monitored by observing the gap between the lugs on the pads pressure plates and the machined surfaces on the caliper frame, when the brake is applied. Pads must be replaced (see 3.2) before the gap is reduced to zero. (The maximum allowable wear on a pad is 10mm). 3. Maintenance CALIPER 3.1 Ensure that the brake pad and disc remain tree from oil and grease. Clean the disc as require. If the pads become contaminated they should be replaced. Carry out any periodic statutory testing that is required, or...

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DB4604 GMR-SD and GMR40-SD Disc Brake Caliper - Spring Applied, Air Released - 5

GMR-SD and GMR40-SD Disc Brake Caliper - Spring Applied, Air Released 3.7 Leakage of air past the rod seal or the ‘slip-0-ring’ seal may be caused by damage to the seals, or by damage to the pushrod or to the spacer. The surface of the pushrod must be smooth and free from scoring or bruising. Note that the pushrod cannot be removed whilst the thruster is dismantled. (For removal and replacement of the push rod see 3.11 below). The rod seal (which has two parts, the P.T.F.E. sealing ring and an 0-ring) may be removed using a small screwdriver or similar tool. Take care not to damage the...

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DB4604 GMR-SD and GMR40-SD Disc Brake Caliper - Spring Applied, Air Released - 6

GMR-SD and GMR40-SD Disc Brake Caliper - Spring Applied, Air 1830 Released Disc Diameter mm 610 760 915 1065 1220 1370 1525 0 0·5 Air barAir Pressure Air Pressure -Pressure - bar - bar Minimum Pressure for Full Retraction 3·8 bar Maximum Pressure 6 bar Minimum Pressure for Full Retraction 3·8 bar Maximum Pressure 6 bar 10Minimum Pressure for Full Retraction 3·8 bar 12 14 16 18 Maximum Pressure 6 bar Braking Torque kNm Brake performance at 30 kN braking force 0 Air bar Air Pressure Air Pressure - Pressure - bar - bar Minimum Pressure for Full Retraction 3·3 bar Maximum Pressure 5 bar Minimum...

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